The most common and most likely answer to this crossword clue is the 10 letter word STORYBOARD
I've seen this crossword clue in Financial Times
S
T
O
R
Y
B
O
A
R
D
Buddy explains!
The straight part
We know that "Details of plot" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case details of plot = storyboard.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does STORYBOARD mean?
STORYBOARD noun- A series of drawings that lay out the sequence of scenes in a film or series, especially an animated one.
- Any sequence of drawings or diagrams which illustrate a sequence of events, e.g. in an accident or as a flowsheet for computer programming.
- To create and arrange storyboard drawings.